das Häufchen
dog poop
A euphemistic term for a small amount of feces, especially from a pet such as a dog or cat.
Bitte denken Sie daran, das Häufchen Ihres Hundes sofort zu entfernen.
Please remember to remove your dog's poop immediately.

little pile / dog poop
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dog poop
A euphemistic term for a small amount of feces, especially from a pet such as a dog or cat.
Bitte denken Sie daran, das Häufchen Ihres Hundes sofort zu entfernen.
Please remember to remove your dog's poop immediately.

'Häufchen' is the diminutive form of 'der Haufen' (pile). The ending '-chen' makes the word small and cute and always changes the article to 'das'.
Aus dem großen Haufen Sand wurde ein kleines Häufchen.
The big pile of sand became a little pile.
In this meaning, 'Häufchen' is a euphemistic and very common way to refer to animal feces, almost always from a dog. Typical verbs are 'ein Häufchen machen' (to do a poop) or 'ein Häufchen wegmachen' (to clean up a poop).
Hundebesitzer sind verpflichtet, die Häufchen ihrer Tiere zu beseitigen.
Dog owners are required to remove their animals' poop.
The expression 'ein Häufchen Elend' (a picture of misery) is a fixed unit. It describes a person who looks extremely sad, sick, or exhausted and makes a pitiful impression.
Nach der Trennung war sie wochenlang nur noch ein Häufchen Elend.
After the breakup, she was nothing but a picture of misery for weeks.
When referring to a small amount of a substance, 'Häufchen' is often combined with things that can be piled up, e.g. 'ein Häufchen Salz' (a little pile of salt), 'ein Häufchen Staub' (a little pile of dust), or 'ein Häufchen Erde' (a little pile of soil).
Auf dem alten Buch hatte sich ein Häufchen Staub angesammelt.
A little pile of dust had gathered on the old book.
When 'Häufchen' is used for a small group of people, it emphasizes their small number. It often carries a slightly regretful or sympathetic tone.
Am Ende der Veranstaltung war nur noch ein Häufchen Zuhörer übrig.
At the end of the event, only a small group of listeners was left.
group
'Gruppe' and 'Häufchen' can both mean a number of people. 'Gruppe' is neutral and can be small or large. In this meaning, 'Häufchen' refers to a very small group and often sounds somewhat disparaging or pitying: it makes it seem as if there are only a few people, or as if they are not very important. Learners may confuse the words because both can describe several people. In normal situations, it is better to use 'Gruppe'. 'Häufchen' only fits when you want to especially emphasize the small number.

Vor der Bühne stand nur ein kleines Häufchen Zuschauer.
Only a small group of spectators stood in front of the stage.
Tom bildet im Kurs eine Gruppe für die Prüfung.
Tom forms a group in the course for the exam.